Civil Engineering MCQAE Level Civil Engineering
Water hammer pressure (Joukowski pressure rise) in a pipe when a valve is closed instantaneously is:
Fluid MechanicsWater HammerMEDIUM
Choose the correct answer
A
Delta_p = rho x c x V
B
Delta_p = rho x V^2 / 2
C
Delta_p = rho x V x sqrt(2g)
D
Delta_p = V x sqrt(rho x K)
Correct Answer
A. Delta_p = rho x c x V
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Joukowski: Delta_p = rho x c x DeltaV, where c = wave speed = sqrt(K/rho) (for rigid pipe) and DeltaV = change in velocity. For full closure: Delta_p = rho x c x V. This can be very large in long pipelines.
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